refactor: refactor relay part (#957)

* refactor: refactor relay part

* refactor: refactor config part

common/logger/logger.go

@@ -0,0 +1,104 @@
+package logger
+
+import (
+	"context"
+	"fmt"
+	"github.com/gin-gonic/gin"
+	"io"
+	"log"
+	"os"
+	"path/filepath"
+	"sync"
+	"time"
+)
+
+const (
+	loggerINFO  = "INFO"
+	loggerWarn  = "WARN"
+	loggerError = "ERR"
+)
+
+const maxLogCount = 1000000
+
+var logCount int
+var setupLogLock sync.Mutex
+var setupLogWorking bool
+
+func SetupLogger() {
+	if LogDir != "" {
+		ok := setupLogLock.TryLock()
+		if !ok {
+			log.Println("setup log is already working")
+			return
+		}
+		defer func() {
+			setupLogLock.Unlock()
+			setupLogWorking = false
+		}()
+		logPath := filepath.Join(LogDir, fmt.Sprintf("oneapi-%s.log", time.Now().Format("20060102")))
+		fd, err := os.OpenFile(logPath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+		if err != nil {
+			log.Fatal("failed to open log file")
+		}
+		gin.DefaultWriter = io.MultiWriter(os.Stdout, fd)
+		gin.DefaultErrorWriter = io.MultiWriter(os.Stderr, fd)
+	}
+}
+
+func SysLog(s string) {
+	t := time.Now()
+	_, _ = fmt.Fprintf(gin.DefaultWriter, "[SYS] %v | %s \n", t.Format("2006/01/02 - 15:04:05"), s)
+}
+
+func SysError(s string) {
+	t := time.Now()
+	_, _ = fmt.Fprintf(gin.DefaultErrorWriter, "[SYS] %v | %s \n", t.Format("2006/01/02 - 15:04:05"), s)
+}
+
+func Info(ctx context.Context, msg string) {
+	logHelper(ctx, loggerINFO, msg)
+}
+
+func Warn(ctx context.Context, msg string) {
+	logHelper(ctx, loggerWarn, msg)
+}
+
+func Error(ctx context.Context, msg string) {
+	logHelper(ctx, loggerError, msg)
+}
+
+func Infof(ctx context.Context, format string, a ...any) {
+	Info(ctx, fmt.Sprintf(format, a))
+}
+
+func Warnf(ctx context.Context, format string, a ...any) {
+	Warn(ctx, fmt.Sprintf(format, a))
+}
+
+func Errorf(ctx context.Context, format string, a ...any) {
+	Error(ctx, fmt.Sprintf(format, a))
+}
+
+func logHelper(ctx context.Context, level string, msg string) {
+	writer := gin.DefaultErrorWriter
+	if level == loggerINFO {
+		writer = gin.DefaultWriter
+	}
+	id := ctx.Value(RequestIdKey)
+	now := time.Now()
+	_, _ = fmt.Fprintf(writer, "[%s] %v | %s | %s \n", level, now.Format("2006/01/02 - 15:04:05"), id, msg)
+	logCount++ // we don't need accurate count, so no lock here
+	if logCount > maxLogCount && !setupLogWorking {
+		logCount = 0
+		setupLogWorking = true
+		go func() {
+			SetupLogger()
+		}()
+	}
+}
+
+func FatalLog(v ...any) {
+	t := time.Now()
+	_, _ = fmt.Fprintf(gin.DefaultErrorWriter, "[FATAL] %v | %v \n", t.Format("2006/01/02 - 15:04:05"), v)
+	os.Exit(1)
+}